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Temperature selector cable broken , the heater bypass valve broken , stuck closed or vaccum going to the control valve broken.

Answerwell sounds like the heater core is plugged,try to flush it out with a hose than reinstall the hoses backwards to reverse the flow.or you have an hvac concern mabye the blend door is not actuating.if the vehicle is reaching operating temp than the thermostat mustent be stuck open.
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โˆ™ 2011-09-13 17:07:31
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Q: Why won't a Chevy 1993 G20 Conversion Van blow hot air even when the engine is warm?
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